EX-99.CERT

                              MFS SERIES TRUST VIII

         CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT

I, Richard M. Hisey, certify that:

1.  I have reviewed this report on Form N-CSR of MFS Series Trust VIII;

2.  Based on my knowledge, this report does not contain any untrue statement of
    a material fact or omit to state a material fact necessary to make the
    statements made, in light of the circumstances under which such statements
    were made, not misleading with respect to the period covered by this report;

3.  Based on my knowledge, the financial statements, and other financial
    information included in this report, fairly present in all material respects
    the financial condition, results of operations, changes in net assets, and
    cash flows (if the financial statements are required to include a statement
    of cash flows) of the registrant as of, and for, the periods presented in
    this report;

4.  The registrant's other certifying officers and I are responsible for
    establishing and maintaining disclosure controls and procedures (as defined
    in Rule 30a-2(c) under the Investment Company Act of 1940) for the
    registrant and have:

    a.  designed such disclosure controls and procedures to ensure that material
        information relating to the registrant, including its consolidated
        subsidiaries, is made known to us by others within those entities,
        particularly during the period in which this report is being prepared;

    b.  evaluated the effectiveness of the registrant's disclosure controls and
        procedures as of a date within 90 days prior to the filing date of this
        report (the "Evaluation Date"); and

    c.  presented in this report our conclusions about the effectiveness of the
        disclosure controls and procedures based on our evaluation as of the
        Evaluation Date;

5.  The registrant's other certifying officers and I have disclosed, based on
    our most recent evaluation, to the registrant's auditors and the audit
    committee of the registrant's board of directors (or persons performing the
    equivalent functions):

    a.  all significant deficiencies in the design or operation of internal
        controls which could adversely affect the registrant's ability to
        record, process, summarize, and report financial data and have
        identified for the registrant's auditors any material weaknesses in
        internal controls; and

    b.  any fraud, whether or not material, that involves management or other
        employees who have a significant role in the registrant's internal
        controls; and

6.  The registrant's other certifying officers and I have indicated in this
    report whether or not there were significant changes in internal controls or
    in other factors that could significantly affect internal controls
    subsequent to the date of our most recent evaluation, including any
    corrective actions with regard to significant deficiencies and material
    weaknesses.

Date:  June 23, 2003                          /s/ RICHARD M. HISEY
       -------------                          ----------------------------------
                                              Richard M. Hisey
                                              Treasurer (Principal Financial
                                              Officer and Accounting Officer)

                                                                      EX-99.CERT

                              MFS SERIES TRUST VIII

         CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT

I, John W. Ballen, certify that:

1.  I have reviewed this report on Form N-CSR of MFS Series Trust VIII;

2.  Based on my knowledge, this report does not contain any untrue statement of
    a material fact or omit to state a material fact necessary to make the
    statements made, in light of the circumstances under which such statements
    were made, not misleading with respect to the period covered by this report;

3.  Based on my knowledge, the financial statements, and other financial
    information included in this report, fairly present in all material respects
    the financial condition, results of operations, changes in net assets, and
    cash flows (if the financial statements are required to include a statement
    of cash flows) of the registrant as of, and for, the periods presented in
    this report;

4.  The registrant's other certifying officers and I are responsible for
    establishing and maintaining disclosure controls and procedures (as defined
    in Rule 30a-2(c) under the Investment Company Act of 1940) for the
    registrant and have:

    d.  designed such disclosure controls and procedures to ensure that material
        information relating to the registrant, including its consolidated
        subsidiaries, is made known to us by others within those entities,
        particularly during the period in which this report is being prepared;

    e.  evaluated the effectiveness of the registrant's disclosure controls and
        procedures as of a date within 90 days prior to the filing date of this
        report (the "Evaluation Date"); and

    f.  presented in this report our conclusions about the effectiveness of the
        disclosure controls and procedures based on our evaluation as of the
        Evaluation Date;

5.  The registrant's other certifying officers and I have disclosed, based on
    our most recent evaluation, to the registrant's auditors and the audit
    committee of the registrant's board of directors (or persons performing the
    equivalent functions):

    c.  all significant deficiencies in the design or operation of internal
        controls which could adversely affect the registrant's ability to
        record, process, summarize, and report financial data and have
        identified for the registrant's auditors any material weaknesses in
        internal controls; and

    d.  any fraud, whether or not material, that involves management or other
        employees who have a significant role in the registrant's internal
        controls; and

6.  The registrant's other certifying officers and I have indicated in this
    report whether or not there were significant changes in internal controls or
    in other factors that could significantly affect internal controls
    subsequent to the date of our most recent evaluation, including any
    corrective actions with regard to significant deficiencies and material
    weaknesses.

Date:   June 23, 2003                    /s/ JOHN W. BALLEN
        -------------                    ---------------------------------------
                                         John W. Ballen
                                         President (Principal Executive Officer)



                                                          ADDITIONAL EX-99.CERT

                             MFS SERIES TRUST VIII

         CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT

I, Richard M. Hisey, certify that:

1.  The Form N-CSR (the "Report") of MFS Series Trust VIII (the "Registrant")
    fully complies with the requirements of Section 13(a) or 15(d) of the
    Securities Exchange Act of 1934; and

2.  The information contained in the Report fairly presents, in all material
    respects, the financial condition and results of operations of the
    Registrant.

Date:   June 23, 2003                    /s/ RICHARD M. HISEY
        -------------                    ---------------------------------------
                                         Richard M. Hisey
                                         Treasurer (Principal Financial
                                         Officer and Accounting Officer)


A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE REGISTRANT AND WILL BE RETAINED BY THE REGISTRANT AND FURNISHED
TO THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.



                                                           ADDITIONAL EX-99.CERT

                              MFS SERIES TRUST VIII

         CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT

I, John W. Ballen, certify that:

3.  The Form N-CSR (the "Report") of MFS Series Trust VIII (the "Registrant ")
    fully complies with the requirements of Section 13(a) or 15(d) of the
    Securities Exchange Act of 1934; and

4.  The information contained in the Report fairly presents, in all material
    respects, the financial condition and results of operations of the
    Registrant.



Date:   June 23, 2003                    /s/ JOHN W. BALLEN
        -------------                    ---------------------------------------
                                         John W. Ballen
                                         President (Principal Executive Officer)


A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE REGISTRANT AND WILL BE RETAINED BY THE REGISTRANT AND FURNISHED
TO THE SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.